Not sure what you are asking... Who specifically made the barrel?
Keep in mind I'm NOT a historian, I work on these rifles, both original & reproductions, I can only tell you what I've seen.
Is this an original Sharps, one of the makers that owned Sharps name through the years, one of the military knock-offs, Shiloh Sharps or something else?
1:18" is the tightest twist I've ever seen in an original Sharps.
It's also the tightest twist I've seen in Shiloh Sharps reproductions.
Original Sharps usually had 1:20" in .45, 1:18 showed up a bunch more in .40 caliber than .45 caliber.
The 34" barrel isn't common in original rifles (Quigley Movie Reproductions are common in .45-70), combine that with 1:18" twist rate and I'd say it's a reproduction, the most common being Shiloh Sharps.
Did you find any stamps on the barrel? Caliber? Proof marks?
A makers mark is common right in front of the threads, often on the direct bottom.